BX: Reaching the Limit of the Position Counter

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om_tech_support_JT
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BX: Reaching the Limit of the Position Counter

Postby om_tech_support_JT » Tue Jul 03, 2012 2:34 pm

Q: I'm using the OPX-1A digital control module with your BX series system for simple position control and display. In the extended functions manual, you say that the max range for the position counter is the same as the position setting range of -8,388,608 to 8,388,607 steps. What if I reach the limit in either the positive or negative direction? What happens?

A: There are things you can do to prevent your position counter from reaching its limit. Regular electrical or mechanical homing routines should be present in any positioning operation. Doing this will reset the pulse counter. The pulse counter also resets if you cycle the power to the driver. If you do reach the limit of the pulse counter, it will actually start counting backwards on the OPX-1A display. Since this introduces position display inaccuracies, we would suggest that you connect the encoder pulse output signals from the driver (ASG and BSG outputs) to an external pulse counter so you can keep better position data. These output pulses are not affected by any limits. The ASG output pulse signal tells position data while the BSG output pulse signal tells direction data. Please contact us if you have any questions.

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